I currently have 2 250W phoenix 14000K HQI's in my system. I have 4 actinic bulbs that have not been used (except for an hour before and an hour after the halides) b/c the phoenix bulbs are so blue already. I was considering putting 20000K bulbs in, and was wondering if anyone had brand names to consider when purchasing my next 2 bulbs? I have loved the phoenix, and no doubt will last a good bit longer, but I'd rather have the others ready to go when it's time. Thanks!